<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <div id="app">
        <input type="text" v-model="num1">+<input type="text" v-model="num2"/>={{Number.parseInt(num1)+Number.parseInt(num2)}}
    </div>
</body>
<script>
    new Vue({
        el:"#app",
        data:{
            num1:100,
            num2:20
        }
    })
</script>
</html>